Synthesis and characterization of polypyrrole/Sn-doped TiO2 nanocomposites (NCs) as a protective pigment

► The dispersion of synthesized PPy in the presence of Sn-doped TiO2 NPs is more than TiO2 NPs. ► The increase of PPy dispersion can increase the efficiency of PPy in corrosion control. ► The band gap of TiO2 NPs increases with doped of Sn in lattice of TiO2. ► The increase of the band gap can decrease the charge transfer through the coating.